public class Circle extends Shape {
    private static final double PAI = 3.14;
    public Circle(int side) {
        super(side);
    }
    @Override
    public double  area() {
     double area = PAI*Math.pow(side,2);
     return area;
    }
    @Override
    public double length() {
        double length = 2*PAI*side;
        return length;
    }
}
